Get the syntax node(s) where this symbol was declared in source. Some symbols (for example,
partial classes) may be defined in more than one location. This property should return
one or more syntax nodes only if the symbol was declared in source code and also was
not implicitly declared (see the IsImplicitlyDeclared property).
Note that for namespace symbol, the declaring syntax might be declaring a nested namespace.
For example, the declaring syntax node for N1 in "namespace N1.N2 {...}" is the entire
NamespaceDeclarationSyntax for N1.N2. For the global namespace, the declaring syntax will
be the CompilationUnitSyntax.

Indicates that this symbol uses metadata that cannot be supported by the language.
Examples include:
- Pointer types in VB
- ByRef return type
- Required custom modifiers
This is distinguished from, for example, references to metadata symbols defined in assemblies that weren't referenced.
Symbols where this returns true can never be used successfully, and thus should never appear in any IDE feature.
This is set for metadata symbols, as follows:
Type - if a type is unsupported (e.g., a pointer type, etc.)
Method - parameter or return type is unsupported
Field - type is unsupported
Event - type is unsupported
Property - type is unsupported
Parameter - type is unsupported

Gets the name of a symbol as it appears in metadata. Most of the time, this
is the same as the Name property, with the following exceptions:
1) The metadata name of generic types includes the "`1", "`2" etc. suffix that
indicates the number of type parameters (it does not include, however, names of
containing types or namespaces).
2) The metadata name of explicit interface names have spaces removed, compared to
the name property.
3) The length of names is limited to not exceed metadata restrictions.